1. School of Physics and Astronomy, University of Glasgow, Kelvin Building, University Avenue, Glasgow G12 8QQ,
United Kingdom
2. School of Engineering, University of Glasgow,
Rankine Building, Oakfield Avenue, Glasgow G12 8LT, United Kingdom
3. L-NESS, Dipartimento di Fisica del Politecnico di Milano, Polo Territoriale di Como, Via Anzani 42, Como I-22100,
Italy
4. Institute of Physics ASCR, v.v.i.,
Cukrovarnická 10, 162 53 Praha 6, Czech Republic
5. Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic
6. Center for Life NanoScience@Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena 291, Rome I-00161,
Italy
7. Ernst Ruska-Centre (ER-C) for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH, 52425 Jülich,
Germany